Question: What recurring event is present in the language of Esperanto?
Paraphrase: What repeating occasion is display within the dialect of Esperanto?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P2936 wd:Q143 . ?sbj wdt:P31 wd:Q15275719 } 
Answer: Luminesk', Iranian Esperanto Congress, PEKO, Summer Esperanto Study, World Congress of Esperanto, Esperanto Youth Week